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Spin pumping with coherent elastic waves.

M Weiler1, H Huebl, F S Goerg

  • 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.

Physical Review Letters
|June 12, 2012
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Researchers demonstrate acoustic spin pumping, using sound waves to generate spin currents in magnetic materials at room temperature. This resonant method offers a new way to control spin dynamics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Spin currents are crucial for spintronics.
  • Generating spin currents efficiently, especially at room temperature, remains a challenge.
  • Acoustic excitation offers a potential new route for spin current generation.

Purpose of the Study:

  • To investigate the generation of spin currents via resonant coupling of phonons and magnons.
  • To establish acoustic spin pumping as a viable method for spin current generation.
  • To explore the dependence of spin current generation on external magnetic fields.

Main Methods:

  • Utilizing surface acoustic wave (SAW) pulses to excite coherent elastic waves in a Co/Pt bilayer.
  • Employing the inverse spin Hall effect in Pt to detect and quantify the generated spin current.
  • Measuring the spin current evolution as a function of time and magnetic field parameters.

Main Results:

  • Demonstrated resonant coupling between phonons and magnons.
  • Successfully generated spin currents at room temperature using acoustic excitation.
  • Observed that spin current generation is exclusive to resonant elastic excitation.

Conclusions:

  • Acoustic spin pumping is a resonant phenomenon.
  • This method provides a novel, acoustically driven pathway for spin current generation.
  • Acoustic spin pumping serves as a resonant analogue to the spin Seebeck effect.